A Cadillac Escalade. Synonym: Bush-mobile. So named because it is ugly and useless, like a grotesquely obese woman, and an expensive, absurd waste that costs the user up to a thousand dollars a day, like heroin.

When I drive my Mom's Scag to the gas station every day, all the girls in 11th grade think I am a playa. I am sure that is why they laugh and point when they see me.

abbreviation of 'scumbag' meaning exactly that, or lowlife, cad, overall person of ill character. useful when avoiding expletives in potential road rage situations, and also used in 'Mad Max' the movie.

driver : that scag just cut me up at the roundabout!
passenger : yeah he was driving like a scag! asshole.